Joining of wires, particularly fine wires used in the manufacture of electric coils



Jan. 21, 1947. GILLIVER JOINING OF WIRES, PARTICULARLY FINE WIRES USED IN THE MANUFACTURE OF ELECTRIC COILS Filed Feb. 12, 1944 2 Sheets-Sheet 1 I nverztor- B WM A itorney Jan. 21, 1947. G. GILLIVER 2,414,461

JOINING OF WIRES, PARTICULARLY FINE WIRES USED IN THE MANUFACTURE OF ELECTRIC COILS Filed Feb. 12, 194A 2 Sheets-Sheet 2 Inventor MM 61mm.

Attorney Patented ..Ean. 21, 1947 2,414,461 ICE JOINING 0F WIRES, PARTICULARLY FINE WIRES USED IN THE MANUFACTURE OF ELECTRIC COILS Gilbert Giiliver, London, England, assignor, by mesne assignments, to International Standard Electric Corporation, New York, N. Y., a corporation of Delaware Application February 12, 1944, Serial No. 522,068 In Great Britain March 30, 1943 15 Claims.

This invention relates to improvements in the joining of wires, and is an improvement in or modification of the invention described and claimed in applications Nos. 480,310 and 481,068, the latter now Patent No. 2,371,438, dated March 13, 1945, and has for its main object to provide an improved construction of hand tool employing the principles embodied in the above applications.

According to the present invention there is provided a hand tool for joining wires by electric fuse welding comprising a casing constituting a handle and having a recess in one end thereof to receive the wires to be joined, a pair of electrodes adjacent to said recess and adapted to be bridged by the wires, a trigger lever pivotally supported in said casing and operatively connected with a hinged member adapted, when operated, to provide a shield over said recess, a clamping piece carried by said hinged member and adapted to co-operate with one of the electrodes to grip the wires to be joined and to press them into contact with the other electrode and a switch in the casing adapted to be closed by the operation of said trigger lever to close a circuit through the electrodes and the wires to be joined.

The casing is preferably constituted by two moulded parts provided with stops and recesses by which the electrode supporting springs, switch springs and the like are located and secured on assembly of the two casing members without the aid of auxiliary securing devices, The various parts, such as the electrode supporting springs and switch springs, are preferably preassembled and the electrical connections in the tool are made by electric fuse welding before location in the moulded handle parts.

The electrodes may consist of carbon blocks secured to metal slide members by which they may be detachably mounted on the spring supports so that the carbon electrodes may be readily replaced.

The casing is provided with one or more openings near the electrodes through which any waste material formed in the joining of the Wires may be discharged.

In order that the invention may be clearly understood a description will be given of one of its embodiments, reference being made for this purpose to the accompanying drawings in which:

Figs, 1 and 2 are external side and front views respectively of the assembled tool; and

Figs. 3 and 4 show the two main moulded parts separated, so that the internal parts and their arrangement are displayed.

The main casing comprises two mouldings i and 2 which are clamped together by five screws and nuts embedded in recesses as shown by Fig. 2. These mouldings when clamped pivotally secure the cover plate 3 and trigger lever 4, the

iii)

pivots being indicated at 5 and 6 respectively.

The trigger lever 4 is connected to the cover plate 3 by link 7 and pins 8 and 9. Extension ID of the trigger lever operates the contact springs H and I2, while the lever is restored by spring l3, which is located in position by the slot l4 in boss 15.

The cable 16, contact springs H and I2, resistance l'l, spring [3, springs I 8, l9 are all located by being suitably formed to fit in recesses or slots provided in one of the mouldings and corresponding projections or stops are provided on the other moulding to secure these parts in position when the mouldings are clamped together.

The carbon electrodes 20, 2| and 22 are secured to grooved slide members which fit over springs l8, l9 and 23, the springs being indented and shaped so as to aiiord a frictional grip on, and a stop for, the effective location of the carbons in their correct positions. The carbons are thus readily replaceable and interchangeable on their respective springs.

Stamped out tongues are provided on spring 48, on contact springs H and i2, and on spring l9 so that the cable and other electrical connections can be fuse welded by the process described in the above mentioned specifications.

Apertures are provided in the casing at 24 so that any waste material formed in the joining of the wires may be discharged,

Recesses are provided in the casing at 25 adjacent to the electrodes for the ready insertion of the wires to be joined. The cover plate 3 has spring 23 riveted to it and when operated by trigger 4 through the medium of link I, clamps the wires inserted through recess 25, between carbons 22 and 20, and by reason of a groove 26 which fits over projection 21 on the main mouldings acts as a shield to protect the eyes from the flash accompanying the fuse welding operation.

In operation, the wires to be joined are cleaned, twisted together and inserted through recess 25 so that they lie across carbon 20 and rest on carbon 2|. When trigger 4 is operated, carbon 22 clamps the wires on the resiliently mounted car- Icon 20, the contacts on springs ii and i2 are closed and the wires fused in the space between carbons. 20 and 2i forming a globule near carbon 2|. This opens the circuit and trigger 4 is then released and the wires withdrawn. It will be understood that the supply conductors in cable t6 are connected one to electrode iii via the switch. springs H and I2 and the other to electrode 2}.

via the resistance l7. What is claimed is: I

1. In a hand-operated welding device for elecelectrodes supported by said handle to engage said wires at longitudinally spaced portions, and

least one of said electrodes.

2. A device according to claim 1, wherein said handle has a recess formed therein to receive said wires in a position above said electrodes.

3. A device according to claim 1, wherein a projecting portion of said handle has a recess formed therein to receive said wires in a position above said electrodes and said clamping means are arranged to project from said handle and to form a flash-protecting shield over said recess. I

4. Av device according to claim 1, wherein said trigger means comprise a triggering lever pivotally supported in the handle, and said clampin means'comprise a pivotally supported clamping lever, an intermediate lever being arranged inside the handle to connect said triggering lever with said clamping lever.

, 5. A device according to claim 1, wherein said trigger means comprise a triggering lever pivotally supported in the handle, and said clamping means comprise a pivotally supported clamping lever, a clamping block, and a metal holder supporting the block and supported by the clamping lever, an intermediate lever being arranged inside the handle to connect said triggering lever with said clamping lever; j r

6. A device according to claim 1, wherein said trigger means control an electric switch inside the handle and in circuit-with said electrodes.

; 7. A device according to claim 1, which comprises an electric switch inside the handle and in circuit'with said electrodes, and in which said trigger means comprise a triggering lever pivotally supported in the handle and arranged when operated to engage said electric switch, and said clamping means comprise a pivotally supported clamping lever, an intermediate lever being arranged inside the handle to connect said triggering lever with said clamping lever. Y

,;8. A device according to claim 1, wherein said trigger means comprise a triggering lever pivotally supported in the handle and a spring arranged inside the handle to oppose the movement of said triggering lever when operated, and said clamping means comprise a pivotally supported clamping lever, an intermediate lever being arranged inside the handle to connect said triggering lever with said clamping lever.-

, 9. A device according to claim 1, which comprises an electric switch inside the handle and in which said trigger means comprise a triggering lever pivotally supported in the handle to operate said switch inside the handleand a spring arranged to oppose the movement of said triggering lever when operated, and said clamping means comprise a pivotally supported clamping lever, an intermediate lever being arranged inside the handle to connect said triggering lever with said clamping lever,said electric switch consisting of opposed leaf springs carrying contacts, said triggering lever being arranged when operated to engage at least one of said leaf springs to close said contacts. I

10. In a hand-operated welding device for electrically fusing longitudinally contacting wires, a handle formed to be held in the palm of the hand, trigger means projecting from said handle and arranged to be controlled by the index finger oi saidhand, apair of electrodes ,supportedlby said handle to engage said wires at longitudinally spaced portions, spring means supporting said electrodes and supported in the handle, and clamping means controlled by said trigger to hold said wires against at least one of saidelectrodes.

. 11. A device according to claim 1, wherein said handle is formed of two molded pieces rigidly attached to each other to position, when assembled, therebetween triggering, clamping means and supporting means for the electrodes without these means being attached to said pieces.

12. In a hand-operated welding device for electrically fusing longitudinally contacting wires, a handle formed to be held in the palm of the hand, trigger means projecting from said handleand arranged to be controlled bythe index finger of said hand against the force of a spring, a pair of electrodes, spring means supporting said electrode andsuppo rted by said handle to engage said wires at longitudinally spaced portions, clamping means controlled by said trigger to hold said Wires against at least one of said electrodes, and electric switch means including leaf springs carrying contacts, said handle being formed of two molded pieces to position therebetween, when assembled, trigger means, electrode supporting means and electric switch means, without these means being further attached to said pieces, said molded pieces having stop and recess portions formed therein, some of these portions being arranged to position the electrodesupporting sprin s, some other portions being arranged to position the trigger-opposing spring, and some other portions being arranged to position the contact-carrying springs.

handle and arranged to be controlledby the in dex finger of said hand against the force of, a spring, a pair of electrodes, spring means supporting said electrode and supported by said han ranged to position the trigger-opposing spring,

and some other portions being arranged to position the contact-carrying springs, said electrode-' supporting springs and including an electric cable connected to switch and electrodes, and extending, when assembled, from the inside to the outside of the handle. 7

14. -A device according to claim 1, com rising metal slide members, carbon blocks fitting into said metal slide members in a detachablejmam;

her and forming at least one of said electrodes.

15. A device according to claim 1, wherein saidhandle is provided with at least one-opening lo-- cated near said electrodes, through which opening waste material formed by the joining of the wires may be discharged. 3

GI BER? G imm contact-supporting springs forming a single pre-assembled unit 

